阅读说明：本技术 一种焦炉多段集气管吸力自动切换控制系统及方法 (Automatic switching control system and method for suction of multi-section gas collecting pipe of coke oven ) 是由 *** 何谋龙 韩学祥 方亮青 张英 曹先中 宋前顺 樊宏斌 陈学才 于 2019-11-29 设计创作，主要内容包括：本发明公开了一种焦炉多段集气管吸力自动切换控制系统及方法,属于焦炉生产技术领域。本发明的集气管吸力自动切换控制方法,包括集气管的划分、生产段集气管的吸力切换以及装煤结束后集气管的吸力切换。本发明通过采用自动切换控制系统控制焦炉多段集气管的吸力切换,并对整体控制工艺进行优化设计,从而一方面能够对焦炉炭化室内产生的荒煤气进行有效地收集,保证其生产过程中能够无烟装煤,并且也减少了资源的浪费,有利于使焦炉生产符合国家清洁化生产和环境保护的要求；另一方面还减少了能源的浪费,起到了节能的效果。同时也保证了装煤工作时的集气管吸力的自动切换能够周而复始、循环往复的循环进行。(The invention discloses a system and a method for controlling automatic switching of suction of a multi-section gas collecting pipe of a coke oven, belonging to the technical field of coke oven production. The automatic switching control method for the suction of the gas collecting pipe comprises the steps of dividing the gas collecting pipe, switching the suction of the gas collecting pipe in a production section and switching the suction of the gas collecting pipe after coal charging is finished. According to the invention, the suction switching of the multi-section gas collecting pipes of the coke oven is controlled by adopting the automatic switching control system, and the overall control process is optimally designed, so that on one hand, raw coke oven gas generated in the coke oven carbonization chamber can be effectively collected, the smokeless coal charging in the production process can be ensured, the waste of resources is reduced, and the coke oven production can meet the requirements of national clean production and environmental protection; on the other hand, the energy waste is reduced, and the energy-saving effect is achieved. Meanwhile, the automatic switching of the suction force of the gas collecting pipe during the coal charging operation can be carried out in a cycle and a cycle reciprocating manner.)

1. A coke oven multistage gas collecting pipe suction automatic switching control system is characterized in that: the system comprises a production plan server, an HMI (human machine interface) server, a coordinated PLC (programmable logic controller) system, a coke oven DCS (distributed control system), a coal charging car PLC system and an electro-hydraulic actuator (6), wherein the electro-hydraulic actuator (6) is installed on each air suction pipe (4) corresponding to a coke oven gas collecting pipe (3), the coal charging car PLC system is connected with the input end of the production plan server, the output end of the production plan server is connected with the signal input end of the coordinated PLC system through the HMI server, the signal output end of the coordinated PLC system is connected with the signal input end of the coke oven DCS, and the signal output end of the coke oven DCS is connected with the electro-hydraulic.

2. The coke oven multi-segment gas header suction automatic switching control system of claim 1, characterized in that: and a pressure transmitter is also arranged on each section of the gas collecting pipe (3), and the output end of the pressure transmitter is connected with the coke oven DCS.

3. The coke oven multi-segment gas header suction automatic switching control system of claim 2, characterized in that: the production plan server and the HMI server are arranged in a coke oven central control room, and the coordination PLC system is arranged in a coke oven electric room.

4. A coke oven multi-section gas collecting pipe suction automatic switching control method adopts the automatic switching control system of any one of claims 1 to 3 to switch the suction value of a gas collecting pipe, and is characterized by comprising the following steps:

step one, dividing a gas collecting pipe

Each coke oven group is circularly produced according to a 2-1 coke pushing series sequence, and each section of gas collecting pipe of each coke oven group is divided according to the number of the coking chambers;

step two, switching suction of the production section gas collecting pipe

Before a furnace number within a range defined by a certain section of gas collecting pipe is about to be charged with coal, controlling to switch a gas collecting pipe suction value corresponding to the furnace number from a first maintenance set value to a working set value through an automatic switching control system;

step three, switching the suction of the air collecting pipe after coal charging is finished

After the last furnace number in the range defined by the gas collecting pipe in the production section is finished to charge coal, the suction value of the gas collecting pipe in the production section is switched from the working set value to a second maintenance set value through the control of the automatic switching control system, and then the suction value of the gas collecting pipe is switched from the second maintenance set value to a first maintenance set value.

5. The automatic switching control method for the suction force of the multi-section gas collecting pipe of the coke oven as claimed in claim 4, wherein the method comprises the following steps: the working set value is 350Pa, the first overhauling set value is 250Pa, and the second overhauling set value is 300 Pa.

6. The automatic switching control method for the suction force of the multi-section gas collecting pipe of the coke oven as claimed in claim 4, wherein the method comprises the following steps: and after the last furnace number within the range defined by the gas collecting pipe in the production section in the third step is finished, delaying for 30min, switching the suction value of the gas collecting pipe in the section from the working set value to a second maintenance set value, and switching the suction value of the gas collecting pipe in the section from the second maintenance set value to a first maintenance set value when delaying for 60 min.

7. The automatic switching control method for the suction force of the multi-section gas collecting pipe of the coke oven according to any one of claims 4 to 6, wherein the specific process of the suction force switching of the production section gas collecting pipe in the second step is as follows: before the furnace number within the range defined by a certain section of gas collecting pipe is about to be charged with coal, the coal charging car PLC system sends the coal charging planned furnace number to the HMI server through the production planning server, then the HMI server sends the signal to the coordination PLC system, after the coordination PLC system receives the coal charging planned furnace number, comparing the coal charging planned furnace number with the first furnace number and the last furnace number defined by each section of gas collecting pipe, if the coal charging planned furnace number is in the range defined by the section of gas collecting pipe, then outputting a command for changing the suction value of the section of the gas collecting pipe to a coke oven DCS, after receiving the command, the coke oven DCS sends a command for modifying the suction value of the section of the gas collecting pipe from a first maintenance set value to a working set value, after an electro-hydraulic actuator (6) on the air suction pipe (4) corresponding to the section of the gas collecting pipe (3) receives a modification instruction sent by the coke oven DCS, the suction value of the section of the gas collecting pipe is switched to a working set value from a first maintenance set value.

8. The automatic switching control method for the suction force of the multi-section gas collecting pipe of the coke oven according to any one of claims 4 to 6, characterized in that the concrete process of switching the suction force of the gas collecting pipe after the coal charging in the third step is as follows: after the last stove number in the range defined by the production section gas collecting pipe is finished, the coal charging car PLC system sends a coal charging finishing signal of the section gas collecting pipe to the HMI server through the production planning server, then the HMI server sends a signal of the coal charging finishing signal to the coordination PLC system for processing, the coordination PLC system sends a command of the coal charging car PLC system to the coke oven DCS system after the processing is finished, the coke oven DCS system firstly delays for 30min after receiving the command of the coordination PLC system and sends a command of modifying the suction value of the section gas collecting pipe from a working set value to a second maintenance set value, and when the delay is 60min, the coke oven DCS system can send a command of modifying the suction value of the section gas collecting pipe from the second maintenance set value to a first maintenance set value again; after the electro-hydraulic actuator (6) on the section of gas collecting pipe (3) corresponding to the gas suction pipe (4) receives a modification instruction of the coke oven DCS, the suction values of the section of gas collecting pipe are switched at corresponding time respectively.

9. The automatic switching control method for the suction force of the multi-section gas collecting pipe of the coke oven according to any one of claims 4 to 6, characterized in that: the coke oven adopts a single-machine production mode of producing one section of gas collecting pipe and overhauling the other sections of gas collecting pipe.

Technical Field

The invention belongs to the technical field of coke oven production, and particularly relates to a system and a method for automatically switching and controlling suction of a multi-section gas collecting pipe of a coke oven.

Background

The modern coke oven production generally comprises a coke oven and auxiliary facilities thereof, and the whole process of coke oven operation comprises coal charging, coke pushing, coke quenching and coke screening. The coke oven can generate raw coke oven gas while generating coke in the production process of the coke oven, and the raw coke oven gas generated in each carbonization chamber in the coke oven needs to enter a gas purification system for treatment. The domestic 7.63m coke oven is an ultra-large volume coke oven introduced by UHDE company in Germany, wherein the most prominent new process is a new technology for high negative pressure coal charging and dust removal by adopting a gas collecting pipe of a PROven system. As shown in fig. 1, each coke oven 1 is provided with three sections of gas collecting pipes 3 and three gas suction pipes 4, a group of coke ovens comprises six sections of gas collecting pipes 3, six gas suction pipes 4 and a gas suction header pipe 5, raw coke gas generated in each carbonization chamber 2 in the coke oven 1 is collected to the gas suction pipes 4 by the gas collecting pipes 3 and then collected to the gas suction header pipe 5, and finally is sucked to a gas purification system by a fan of a gas purification plant 7 for treatment, so that the raw coke gas is purified to be pure coke oven gas.

At present, when raw coke oven gas in a carbonization chamber is collected in the production process of the existing coke oven, the suction values of six sections of gas collecting pipes corresponding to each group of coke ovens are usually regulated and controlled synchronously, namely the suction values of all the sections of gas collecting pipes are always kept consistent, so that on one hand, raw coke oven gas generated in the carbonization chamber of the coke oven cannot be effectively collected, the collection effect is poor, smokeless coal charging in the production process cannot be ensured, the resource loss is caused, and the requirement of the state on clean production of the coke oven is not met; on the other hand, the synchronous regulation and control of the suction values of the six-section gas collecting pipe can also cause energy waste, and the collection cost of the raw coke oven gas generated in the carbonization chamber is increased.

Relevant patents are published on the suction control technology of the coke oven gas collecting pipe through retrieval.

For example, the chinese patent application No. 201711214320.7 discloses a coke oven gas header pressure stabilizing automatic regulating system and a regulating method thereof, the coke oven gas header pressure stabilizing automatic regulating system includes: the electric control valve of the coal charging section is used for adjusting the pressure in the gas collecting pipe of the coal charging section; a communicating valve for adjusting the pressure in the large circulation pipe; the first-stage computer system comprises a DCS control system, a field sensor and an actuating mechanism and is used for realizing field-level distributed control; and the second-stage computer system is used for adjusting the opening of the electric control valve and the opening of the communicating valve of the coal charging section according to the pressure in the gas collecting pipe of the coal charging section. Although this application can stabilize the fixed coal section gas collecting tube pressure value to focusing furnace gas derives the system and realizes stable control, this application can not effectively improve the collection effect of interior raw coke oven gas of gas collecting tube, also has the waste of the energy simultaneously, and its whole technology remains to be further improved.

Disclosure of Invention

1. Problems to be solved

The invention aims to solve the problems that the raw coke oven gas collection effect is poor and resources and energy are wasted due to unreasonable control of the suction force of a gas collecting pipe in the production process of the existing coke oven, and provides a system and a method for automatically switching the suction force of a multi-section gas collecting pipe of a coke oven. By adopting the technical scheme of the invention, the raw coke oven gas generated in the production process of the coke oven can be effectively collected, so that the smokeless coal charging in the production process can be ensured, the requirements of China on clean production of the coke oven are met, the waste of resources and energy sources is reduced, and the energy-saving effect is achieved.

2. Technical scheme

In order to solve the problems, the technical scheme adopted by the invention is as follows:

the invention discloses a coke oven multi-section gas collecting pipe suction automatic switching control system which comprises a production plan server, an HMI (human machine interface) server, a coordination PLC (programmable logic controller) system, a coke oven DCS (distributed control system), a coal charging car PLC system and an electro-hydraulic actuator, wherein each gas suction pipe corresponding to a coke oven gas collecting pipe is provided with the electro-hydraulic actuator, the coal charging car PLC system is connected with the input end of the production plan server, the output end of the production plan server is connected with the signal input end of the coordination PLC system through the HMI server, the signal output end of the coordination PLC system is connected with the signal input end of the coke oven DCS system, and the signal output end of the DCS system is connected with.

Furthermore, each section of the gas collecting pipe is also provided with a pressure transmitter, and the output end of the pressure transmitter is connected with the coke oven DCS.

Furthermore, the production plan server and the HMI server are arranged in a coke oven central control room, and the coordination PLC system is arranged in a coke oven electric room.

The invention discloses a method for controlling automatic switching of suction force of a multi-section gas collecting pipe of a coke oven, which adopts an automatic switching control system to switch the suction force value of the gas collecting pipe and specifically comprises the following steps:

step one, dividing a gas collecting pipe

Each coke oven group is circularly produced according to a 2-1 coke pushing series sequence, and each section of gas collecting pipe of each coke oven group is divided according to the number of the coking chambers;

step two, switching suction of the production section gas collecting pipe

Before a furnace number within a range defined by a certain section of gas collecting pipe is about to be charged with coal, controlling to switch a gas collecting pipe suction value corresponding to the furnace number from a first maintenance set value to a working set value through an automatic switching control system;

step three, switching the suction of the air collecting pipe after coal charging is finished

After the last furnace number in the range defined by the gas collecting pipe in the production section is finished to charge coal, the suction value of the gas collecting pipe in the production section is switched from the working set value to a second maintenance set value through the control of the automatic switching control system, and then the suction value of the gas collecting pipe is switched from the second maintenance set value to a first maintenance set value.

Furthermore, the working set value is 350Pa, the first overhaul set value is 250Pa, and the second overhaul set value is 300 Pa.

Furthermore, after the last furnace number within the range defined by the gas collecting pipe in the production section in the third step is finished, delaying for 30min, switching the suction value of the gas collecting pipe in the section from the working set value to a second maintenance set value, and switching the suction value of the gas collecting pipe in the section from the second maintenance set value to a first maintenance set value after delaying for 60 min.

Furthermore, the specific process of switching the suction of the production section gas collecting pipe in the step two is as follows: before the furnace number within the range defined by a certain section of gas collecting pipe is about to be charged with coal, the coal charging car PLC system sends the coal charging planned furnace number to the HMI server through the production planning server, then the HMI server sends the signal to the coordination PLC system, after the coordination PLC system receives the coal charging planned furnace number, comparing the coal charging planned furnace number with the first furnace number and the last furnace number defined by each section of gas collecting pipe, if the coal charging planned furnace number is in the range defined by the section of gas collecting pipe, then outputting a command for changing the suction value of the section of the gas collecting pipe to a coke oven DCS, after receiving the command, the coke oven DCS sends a command for modifying the suction value of the section of the gas collecting pipe from a first maintenance set value to a working set value, and after the electro-hydraulic actuator on the air suction pipe corresponding to the section of the gas collecting pipe receives a modification instruction sent by the coke oven DCS, switching the suction value of the section of the gas collecting pipe from a first maintenance set value to a working set value.

Furthermore, the concrete process of switching the suction force of the gas collecting pipe after coal charging in the third step is as follows: after the last stove number in the range defined by the production section gas collecting pipe is finished, the coal charging car PLC system sends a coal charging finishing signal of the section gas collecting pipe to the HMI server through the production planning server, then the HMI server sends a signal of the coal charging finishing signal to the coordination PLC system for processing, the coordination PLC system sends a command of the coal charging car PLC system to the coke oven DCS system after the processing is finished, the coke oven DCS system firstly delays for 30min after receiving the command of the coordination PLC system and sends a command of modifying the suction value of the section gas collecting pipe from a working set value to a second maintenance set value, and when the delay is 60min, the coke oven DCS system can send a command of modifying the suction value of the section gas collecting pipe from the second maintenance set value to a first maintenance set value again; and after the electro-hydraulic actuator on the section of gas collecting pipe corresponding to the gas suction pipe receives the modification instruction of the coke oven DCS, switching the suction value of the section of gas collecting pipe at the corresponding time respectively.

Furthermore, the coke oven adopts a single-machine production mode of producing one section of gas collecting pipe and overhauling the other sections of gas collecting pipe.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the automatic suction switching control system for the multi-section gas collecting pipe of the coke oven, the six components including the production plan server, the HMI server, the coordination PLC system, the coke oven DCS system, the coal charging car PLC system and the electro-hydraulic actuator are arranged and used for automatically controlling the suction switching of the multi-section gas collecting pipe of the coke oven, so that the collecting effect of raw coke oven gas in a carbonization chamber of the coke oven can be improved, the smokeless coal charging in the production process is ensured, and the system meets the national requirements on clean production and environmental protection of the coke oven; meanwhile, the waste of resources and energy sources is reduced, and the energy-saving effect is achieved. In addition, the suction automatic switching control system is adopted to automatically control the suction switching of the multi-section gas collecting pipes of the coke oven, so that the automation technical level of the production operation of the coke oven is improved, the labor intensity is reduced, the production efficiency is improved, the potential safety hazard of the coke oven production is further reduced, the environmental pollution is reduced, and the technical level of the clean production of the coke oven is improved.

(2) According to the automatic switching control method for the suction force of the multi-section gas collecting pipe of the coke oven, the automatic switching control system is adopted to control the suction force switching of the multi-section gas collecting pipe of the coke oven, the whole control process is optimally designed, particularly, the suction force values of all the sections of the gas collecting pipe are respectively controlled, the corresponding suction force values of the gas collecting pipes are automatically switched according to the working condition of the oven number, and the coke pushing sequence and the automatic switching of the suction force values of the gas collecting pipes are combined together, so that raw coke gas generated in a coke oven carbonization chamber can be effectively collected, the smoke-free coal charging in the production process is ensured, the waste of resources is reduced, and the coke oven production is favorable for meeting the requirements of national clean production and environmental protection; on the other hand, the energy waste is reduced, and the energy-saving effect is achieved. Meanwhile, the automatic switching of the suction force of the gas collecting pipe during the coal charging operation can be carried out in a cycle and a cycle reciprocating manner.

(3) According to the automatic suction switching control method for the multi-section gas collecting pipe of the coke oven, the suction value of the multi-section gas collecting pipe of the coke oven is automatically switched to the first overhauling set value, the second overhauling set value and the working set value according to the requirement, particularly, the suction value of the gas collecting pipe is switched from the working set value to the second overhauling set value and then is switched from the second overhauling set value to the first overhauling set value after coal charging is finished, so that raw gas in the gas collecting pipe can be effectively and smoothly led out to a gas purification workshop, the raw gas collecting effect is improved, the resource loss is reduced, the requirements of safe and clean production of the coke oven are well met, the suction of a gas fan can be kept at a relatively low horizontal value through switching, and the energy-saving effect is achieved. Meanwhile, the damage degree of the coke oven body is reduced, and the service life of the coke oven is prolonged.

(4) According to the automatic switching control method for the suction force of the multi-section gas collecting pipe of the coke oven, after the last oven number within the range defined by the gas collecting pipe at the production section is charged with coal, the suction force value of the gas collecting pipe at the section is switched from the working set value to the second maintenance set value within a time delay of 30min, and is switched from the second maintenance set value to the first maintenance set value within a time delay of 60min, so that the suction force value of the gas collecting pipe at the section is switched from large to small to be matched with the change trend of the raw gas generation amount of the coking chamber in the corresponding section from large to small, the raw gas collection effect is improved, the raw gas in the gas collecting pipe can be further ensured to be smoothly led out to a gas purification workshop, and the requirements of safe production and clean production of the coke oven are further met.

(5) According to the automatic switching control method for the suction force of the multi-section gas collecting pipe of the coke oven, disclosed by the invention, the coke pushing series of the coke oven is combined with the automatic switching of the suction force value of the gas collecting pipe, and the oven group of the coke oven is circularly produced according to the 2-1 coke pushing series, so that not only can raw coke gas generated during the coal charging operation of the coke oven be collected, but also the automatic switching of the suction force of the gas collecting pipe during the coal charging operation can be ensured to be carried out in a cycle and a cycle, so that the coal charging operation of the coke oven can be smoothly carried out, and the working efficiency of the coke oven production is ensured.

(6) According to the automatic switching control method for the suction force of the multi-section gas collecting pipe of the coke oven, disclosed by the invention, by adopting an automatic control technology, the suction force switching of the multi-section gas collecting pipe of the coke oven is automatically controlled by using a suction force automatic switching control system, the automation technical level of the production process of the coke oven is also improved, the labor intensity of operators is reduced, the production efficiency of the coke oven is further improved, the problem that the raw gas escapes from a coal charging hole, a riser and an oven door due to untimely switching of the suction force of the gas collecting pipe to cause smoke leakage and fire production is solved, the potential safety hazard of coke oven production is further reduced, the pollution of the raw gas and dust to the working environment and the atmospheric environment in the coal charging operation is also reduced, and the technical level of clean production of the coke. The technical scheme of the invention has scientific design, reasonable steps, safety and reliability and great popularization value.

Drawings

FIG. 1 is a schematic view of the arrangement of control piping on a coke oven of the present invention;

FIG. 2 is a schematic diagram showing the connection of the parts of the automatic suction switching control system according to the present invention;

FIG. 3 is a schematic view of the system control for suction switching of the production run headers of the present invention;

FIG. 4 is a schematic diagram of the system control for switching the suction of the collecting pipe after the coal charging is finished.

In the figure: 1. a coke oven; 2. a carbonization chamber; 3. a gas collecting pipe; 4. an air intake duct; 5. a suction manifold; 6. an electro-hydraulic actuator; 7. a gas purification plant.

Detailed Description

At present, when raw coke oven gas in a coking chamber is collected in the production process of the existing coke oven, the suction values of six sections of gas collecting pipes corresponding to each group of coke ovens are usually regulated and controlled synchronously, namely the suction values of all the sections of gas collecting pipes are always kept consistent, so that on one hand, raw coke oven gas generated in the coking chamber of the coke oven cannot be effectively and smoothly guided out to a gas purification workshop, the raw coke oven gas is poor in collection effect, smokeless coal charging in the production process cannot be guaranteed, resource loss is caused, and the raw coke oven gas does not meet the national requirements on clean production of the coke oven; on the other hand, the waste of energy sources is caused, and the raw gas collection cost is improved.

Based on the above situation, the inventor of the invention carries out optimization design on the automatic switching control system and the method for the suction force of the multi-section gas collecting pipe in the coke oven production. Specifically, as shown in fig. 1 and 2, the automatic switching control system for the suction force of the multi-section gas collecting pipe of the coke oven comprises a production plan server, an HMI server, a coordination PLC system, a coke oven DCS system, a coal charging car PLC system and an electro-hydraulic actuator 6, wherein the electro-hydraulic actuator 6 is installed in the middle of each gas suction pipe 4 corresponding to the gas collecting pipe 3 of the coke oven and is used for correspondingly adjusting the suction force value of each section of gas collecting pipe 3. The coal charging car PLC system is connected with the input end of the production plan server, the output end of the production plan server is connected with the signal input end of the coordination PLC system through the HMI server, the signal output end of the coordination PLC system is connected with the signal input end of the coke oven DCS system, and the signal output end of the coke oven DCS system is connected with the electro-hydraulic actuator 6. One end of each air suction pipe 4 is connected with the corresponding air collecting pipe 3, the other end of each air suction pipe is connected to the air suction header pipe 5, a pressure transmitter is further installed on each section of air collecting pipe 3, the output end of the pressure transmitter is connected with the coke oven DCS system, the pressure in the air collecting pipe 3 corresponding to each air suction pipe 4 is monitored through the pressure transmitter, the monitoring result is fed back to the coke oven DCS system, the on-off of the electro-hydraulic actuator 6 can be controlled according to the pressure in the air collecting pipe 3, and the suction value of the air collecting pipe 3 is regulated and controlled. The production plan server and the HMI server are arranged in a coke oven central control room, and the coordination PLC system is arranged in a coke oven electric room. The production plan server is used for reading the relevant state data of locomotive production and discharging the production plan according to the production process requirement and the coke maturity condition; the HMI server is used for reading states of the four locomotives, namely the coal charging car, the coke pushing car, the coke guide car and the coke quenching car through the coordination PLC and issuing action instructions of the four locomotives.

The invention discloses a method for controlling automatic switching of suction force of a multi-section gas collecting pipe of a coke oven, which adopts an automatic switching control system to switch the suction force value of the gas collecting pipe and specifically comprises the following steps:

step one, dividing a gas collecting pipe

The coke oven adopts a single-machine production mode of producing one section of gas collecting pipe and overhauling the other sections of gas collecting pipe, each coke oven group circularly produces according to a 2-1 coke pushing series sequence, and each section of gas collecting pipe of each coke oven group is divided according to the number of a carbonization chamber;

step two, switching suction of the production section gas collecting pipe

Before a furnace number within a range defined by a certain section of gas collecting pipe is about to be charged with coal, controlling to switch a gas collecting pipe suction value corresponding to the furnace number from a first maintenance set value to a working set value through an automatic switching control system;

step three, switching the suction of the air collecting pipe after coal charging is finished

After the last furnace number in the range defined by the gas collecting pipe in the production section is finished to charge coal, the suction value of the gas collecting pipe in the production section is switched from the working set value to a second maintenance set value through the control of the automatic switching control system, and then the suction value of the gas collecting pipe is switched from the second maintenance set value to a first maintenance set value.

The working set value is 350Pa, the first overhaul set value is 250Pa, and the second overhaul set value is 300 Pa. And after the last furnace number within the range defined by the gas collecting pipe in the production section in the third step is finished, delaying for 30min, switching the suction value of the gas collecting pipe in the section from the working set value to a second maintenance set value, and switching the suction value of the gas collecting pipe in the section from the second maintenance set value to a first maintenance set value when delaying for 60 min.

The inventor of the invention controls the suction switching of the multi-section gas collecting pipes in the coke oven production by adopting the automatic switching control system and optimally designs the overall control process of the suction values of the gas collecting pipes, particularly controls the suction values of the gas collecting pipes of all the sections respectively, and automatically switches the suction values among the multi-section gas collecting pipes of the coke oven to a first maintenance set value, a second maintenance set value and a working set value according to the trend that the gas generation amount is gradually reduced due to the change of the coking process of coal materials in each coking chamber communicated with the gas collecting pipes of all the sections, so that the suction value of the gas collecting pipe which is positioned at the production section and has the largest gas generation amount is kept at a higher working set value, namely 350Pa, the suction value of the gas collecting pipe which is positioned at the production section and has the next gas generation amount is switched to a second maintenance set value, namely 300Pa, and the suction values of the other gas collecting pipes which are positioned at the maintenance section and have lower gas generation amount are kept at a lower level The first maintenance set value is 250Pa, so that the raw gas in the gas collecting pipe can be effectively led out to a gas purification workshop, the raw gas collection effect is improved, the resource loss is reduced, the requirements of national clean production and environmental protection are better met, the suction force of the gas fan can be kept at a relatively low level value by switching, the energy-saving effect is achieved, and the energy waste is reduced. Meanwhile, the negative pressure air suction in the carbonization chamber is avoided, the damage degree of the coke oven body is reduced, and the service life of the coke oven is prolonged. In addition, after the last stove number in the range defined by the production section gas collecting pipe is charged with coal, the suction value of the section gas collecting pipe is switched from the working set value to the second maintenance set value within a time delay of 30min, and is switched from the second maintenance set value to the first maintenance set value within a time delay of 60min, so that the suction value of the section gas collecting pipe is switched from large to small to be matched with the change trend of the generation amount of the crude gas of the carbonization chamber in the corresponding section from large to small, the crude gas collection effect is improved, the crude gas in the gas collecting pipe can be further ensured to be smoothly guided out to a gas purification workshop, and the requirements of safe production and clean production of the coke oven are further met.

It is worth explaining that the invention also combines the automatic switching of the coke pushing sequence and the suction value of the gas collecting pipe together, and carries out the cycle production of the oven group of the coke oven according to the 2-1 coke pushing sequence, thereby not only collecting the raw coke oven gas generated during the coal charging work of the coke oven, but also ensuring the automatic switching of the suction force of the gas collecting pipe during the coal charging work to be carried out in cycles and cycles, thereby ensuring the smooth coal charging work of the coke oven and the working efficiency of the coke oven production. Meanwhile, the suction automatic switching technology control system is adopted to automatically control the suction switching of the multi-section gas collecting pipes of the coke oven, so that the automatic technical level of the production operation of the coke oven is improved, the labor intensity is reduced, the production efficiency is further improved, the problem that a large amount of raw gas escapes from the coal charging hole, the ascending pipe opening and the oven door due to untimely switching of the suction of the gas collecting pipes, the smoke leakage and the fire are caused is solved, the potential safety hazard of the coke oven production is further reduced, the pollution of the raw gas and dust to the working environment and the atmospheric environment in the coal charging operation is reduced, and the technical level of the clean production of the coke oven is improved. The technical scheme of the invention has scientific design, reasonable steps, safety and reliability and great popularization value.

For a further understanding of the present invention, reference will now be made to the following examples which are provided to illustrate the invention.